diff --git a/drmcomposition.h b/drmcomposition.h
index a5d9cf1..ad7a5df 100644
--- a/drmcomposition.h
+++ b/drmcomposition.h
@@ -47,6 +47,7 @@
 
   int SetLayers(size_t num_displays, DrmCompositionDisplayLayersMap *maps);
   int SetDpmsMode(int display, uint32_t dpms_mode);
+  int SetDisplayMode(int display, const DrmMode &display_mode);
 
   std::unique_ptr<DrmDisplayComposition> TakeDisplayComposition(int display);
   DrmDisplayComposition *GetDisplayComposition(int display);